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19-1484; Rev 0; 4/99
SOT Temperature Sensors with
Period/Frequency Output
General Description
The MAX6576/MAX6577 are low-cost, low-current tem-
perature sensors with a single-wire output. The MAX6576
converts the ambient temperature into a square wave
with a period proportional to absolute temperature (°K).
The MAX6577 converts the ambient temperature into a
square wave with a frequency proportional to absolute
temperature. The MAX6576 offers accuracy of ±3°C at
+25°C, ±4.5°C at +85°C, and ±5°C at +125°C. The
MAX6577 offers accuracy of ±3°C at +25°C, ±3.5°C at
+85°C, and ±4.5°C at +125°C.
Both devices feature a single-wire output that minimizes
the number of pins necessary to interface with a micro-
processor. The period/frequency range of the output
square wave can be selected by hard-wiring the two
time-select pins (TS0, TS1) to either V DD or GND. The
MAX6576/MAX6577 are available in space-saving 6-pin
SOT23 packages.
Applications
Critical μP and μC Temperature Monitoring
Features
o Simple Single-Wire Output
o Two Output Types Available
Temperature to Period (μs) (MAX6576)
Temperature to Frequency (Hz) (MAX6577)
o ±0.8°C Accuracy at +25°C (±3°C max)
o No External Components
o Operates from +2.7V to +5.5V Supply Voltage
o Low 140μA Typical Supply Current
o Standard Operating Temperature Range:
-40°C to +125°C
o Small 6-Pin SOT23 Package
Ordering Information
Portable Battery-Powered Equipment
Cell Phones
PART
TEMP. RANGE
PIN-
PACKAGE
SOT
TOP MARK
Battery Packs
MAX6576 ZUT -40°C to +125°C
MAX6577 ZUT -40°C to +125°C
6 SOT23
6 SOT23
AABI
AABJ
Hard Drives/Tape Drives
Networking and Telecom Equipment
Medical Equipment
Automotive
TOP VIEW
Pin Configuration
+2.7V TO +5.5V
Typical Operating Circuit
V DD 1
6
OUT
0.1 μ F
V DD
0.1 μ F
V CC
GND 2
MAX6576
MAX6577
5
TS1
MAX6576
TS1 MAX6577
μ P
TS0
GND
GND
N.C. 3
4
TS0
OUT
I/O
SOT23-6
________________________________________________________________ Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
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